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Chap 9
Physical Science Chapter 9 Vocab
Heat flows from | hot to cold. |
Atoms, molecules, ions, and their subatomic particles are in constant motion according to _____ | kinetic-molecular model. |
When you add _____ and _____ you get total internal energy (TE) | potential energy (PE) and kinetic energy (KE) |
Thermal energy is the _____ of all the kinetic energies of it's particles. | sum |
Thermal energy can only be measured as it is _____ from one system to another. | transferred |
When you gain kinetic energy you increase your _____ and your ______. | thermal energy and your temperature |
Transferring particle kinetic energy, the motion, is called_____. | heating or cooling |
The temp of an object is directly related to the _____. | AVERAGE kinetic energy. |
Fiducial points- | fixed, precisely known, and easily reproducible temperature values. |
Fiducial points on a thermometer | freezing and boiling points of water. |
The advantage of the Kelvin scale is there are | NO negative numbers. |
Thermal expansion - | happens on particle level, when the particles gain energy and expand. |
Electrical resistance- | increases with increasing temperature, is a way to measure how well electricity is conducted. |
Viscosity- | the measure of the resistance of liquids to flow. |
Heat- | the quantity of thermal energy that flows from one place to another. |
Conduction- | when two objects of DIFFERENT temperatures touch, thermal energy moves from the hotter object to the cooler one. |
Diamond- | best natural conductor. |
Conduction is the ______ by which ______ moves through solids. | chief process, thermal energy |
Convection- | thermal energy carried from one location to another by a fluid (gases and liquids). |
Convection current- | hot fluids rise, cold fluids sink. |
Radiation- | thermal enegy that radiates from the source outward. (Think of sun's rays) |
Thermal energy moves most efficiently though a vacuum as_____ | radiant energy |
Vacuum- | large amounts of empty space. No particles or VERY small amounts of particles. |
The ______ the temperature of a substance, the MORE electromagnetic energy is emitted. | higher |
Radiant energy is distinct from thermal energy in | what it does to matter to move between two systems. |
Radiant energy does NOT use matter to move between systems. _______ needs matter to move. | thermal energy |
Insulators- | materials that resist the flow of thermal energy |
Vacuum | best insulator. |
Heat capacity (C) - | The relationship between the amount of thermal energy absorbed and the temperature change caused by this. |
Heat capacity is the amount of _______ an object must______ to raise the temperature of something by 1 degree celsius. | energy, gain |
Specific heat capacity/specific heat (Csp or C)- | the heat capacity per gram of material - the amount of energy that must be gained or lost to change the temp of 1g of the substance. |
Latent heat of fusion- | the amount of thermal energy exchanged per g of material during melting or freezing. (Lazy heat) |
Latent heat of vaporization- | the amount of heat it takes to change a liquid to a gas. |
Freezing- | phase change as a substance changes from a liquid to a solid. |
Melting- | phase change as a substance changes from a solid to a liquid |
Condensation- | phase change as a substance changes from a gas to a liquid. |
Vaporization- | phase change as a substance changes from a liquid to a gas. |
Sublimation- | phase change as a substance changes from a solid to a gas without passing through the intermediate state of liquid. |
Deposition- | phase change as a substance changes from a gas to a solid without passing through the intermediate state of liquid. |
Triple point- | the temperature and pressure at which the solid, liquid, and gas phases exist simultaneously. |
Critical point- | the temperature above which a substance willalways be a gas regardless of the pressure. |
Freezing point- | the temperature at which the solid and the liquid phases of a substance are in equilibrium at atm pressure. |
Boiling point- | the temperature at which the vapor pressure of a liquid is equal to the pressure on a liquid. |